Drill-chuck.



PATENTED AUG.

P. LONBRGAN.

l DRILL CHUCK. A?PLIO ATION FILED AUG. 21, 1907.

P@Zef' Z027 ations.

PETER LONERGAN, or SILVERTON, COLORADO.

DRILL-CHUCK.

Specification of Letters Patent.

Pi TENT OFFICE.

Patented Aug. 4, 1908.

Application filed. August 27, 1907. Serial No. 390,369.v

To all whom it may concern:

Be it known that I, PETER LONERGAN, a citizen of the United States, residing at Silverrou, in the county of San Juan and State of Colorado, have invented new and useful Improvements in Drill-Chucks, of which the following is a specification.

The invention relates generally to an improveinent in drill chucks, eoiiipreheiiding more specifically a drill chuck made up of separable sections adapted to be secured iii cooperating relation to secure the drill iii place.

The inain object of the present invention is the provision of a drill chuck including a removable section adapted when in position to engage and lock the drill shank, the construction including a clamping ring or sleeve operative to secure the reiiiovable section in applied or drill-holding position.

Another object of the invention is the provision'of a yieldahle scat for the drill, whereby the latter may be properly centered in the chuck and the strain on the drill cvcnl distributed throughout that` portion o the chuck.

The invention will be described in the following specification, reference being had particularly to the accompanyingdrawing, in \vliich:-.

Figure 1 is a loi'igitudinal section of my iinproved drill chuck, the drill being shown in elevation, Fig. '2 is an end elevation of the same, with the drill iii section, Fig. 3 is a. scction on the line 3-3 of Fig. 1, F ig. -1 is a plan of llie chuck with the locking section removed, F ig. 5 is a perspective of the locking section, Fig. 6 is an end elevation of the chuck, illustrating the use of the spaiiner to properly seat the locking section for the. application of the clamping sleeve.

Referring particu arly to the drawings, wherein is shown the preferred details of construction of the present invention, iiiy improved drill chuck comprises a body 1 of circular contour in transverse section, and

' slightly tapered from the free or drillrecciv ing end.

The body is formed with a longitudinally disposed recess 2, of approximately V-shape in transverse section, the a. )ex or base of t e depression being arrange about centrally o the body and of seiiii-cyliiidrical sha ie in transverse section. as at 3, said rounde depression 3 corresponding approximately to the diameter of the drill si ank and being adapted to receive vthe latter when the parts are assembled. The recess 2 opens through the surface of the body and through the relatively forward end thereof, the. rear end of the recess terminating, however. in advance of the rear end of the bodyv to leave a solid head 4 at said rear end. The relatively rear portion of the recess .2 is of greater transverse dimension than the forward portion,

than the diameter of the depression 3 and being' adapted to receive the head ofthe drillshank, as hereinafter described. The base of the depression 3 is cut out to provide a rectangular socket 7,iii which is litted a resilient base strip S, as a block of rubber or the like, the up )er suiface of the stri) )rojccting nornia ly above the surface oi the depression 3 and being coiicaved in accordance with the curvature of said de iiessioii. T he relatively forward eiid of tl dis )osed in rear of the forward face of the body, while the rear end of the block coincides with the rear end of the depression, so that said block extends throughout the length of the depression except at the for` ward end.

9 represents a clamping section, corres onding in length and sectional contour tov t ie recess 2 in the body, being. therefore, approximately triangular in transverse section with the relatively i'earend 10 of greatcrtransverse dimension at the upper end than the relatively forward end 11. The apex of the clamping section is of seiiiicylindrical contour, as at 12, being of a curvature to snugly fit the shank of the drill, and; therefore, to` gctlier with the depression 3 in the body practically completingr a cylindrical bore to receive and secure ihe drill. The forward end of the body is formed with a bead 13, and at a point beyond the recess 2 the bead is provided with a radially )rejecting stud 14. The forward end 11 of tlie clamping section is also formed with a bead 15 similar to the ie strip or block S is latter when ie parts are assembled.

A locking ring or sleeve 16 1s provided for i cooperation with the chuck body, said sleeve being somewhat less in length than the length of the body and of an interior diameter to correspond with the exterior diameter of the body. The sleeve is slightly conical in longitudinal section, corresponding in this respect to the sectional contour of the body previously noted.

In conjunction with the drill chuck I contem late the use of a particular style of drill, in tiat the shank 17 is terminally provided with an enlarged head 18 designed to fit snugly in the bore 6 of the head 4. In advance of the head 18 the drillshank is reduced to fit within the de ression 3, being in advance of said reduced portion or' octagonal or other angular shape in cross section.

Vith the parts constructed and arranged as described, and the sleeve 16 withdrawn onto the reduced portion of the chuck, and the clamping section removed, the operation of my improved chuck is as follows. The drill is inserted in the body, with the head 18 fitting in the bore 6. The drill shank in advance of the head rests upon the yieldable block 8, and as the u per surface of this block is normally disposed) above the base' of the depression 3, the drill shank is supported entirely by the block. The clamping section is then inserted in the recess 2, the portion 12 of said section resting upon the reduced lengt-h of the drill shank. A Spanner, .as 419, is then engaged with the pin 14 of the body, bearing v'beyond said p in on the outer surface of the clamping section, it being understood that owing to t-he normally increased height of the block 8, the outer surface ofthe clamping section is normally disposed beyond the surface of the body. Pressure is applied to the spanner with the result to force the clamping section down into the recess, until its outer surface is coincident with the outer4 surface of the body. T he locking sleeve 16 is then moved longitudinally of the body, locking the clamping section in place and securing t-he drill chuck parts in operative position with the drill secured therein.

The initial blows of the drill tend to firmly seat the sleeve in locking position, the conical formation of the latter and the bead `13 serving to prevent disconnecting longitudinal movement of the sleeve.

In applied position it will be noted that the drill is practically supported on the yieldable block S, thereby distributing the strain and jar incident to the use of the drill throughout the length of that portion held in the chuck.

in advance of tic head 1S, so that when the.

drill is in lplace relatively longitudinal movement of tie same is absolutely prevented.

The drill may be conveniently removed by simply forcing the sleeve 1G in the relatively rearward direction, freeing the clamping scct'ion 9 and permitting its convenientremoval and consequent freeing of the drill.

-fflaving thus described the invention what is claimed as new, is

1. A drill chuck comprising a body formed for a portion ot its length with a recess, the lower portion of the recess being formed to receive a. drill, a yielda-ble block mounted in the lower portion of the recess, means fitting in said recess to engage the drill, 'and means to lock the parts in applied position.

2. A drill chuck comprising a body formed for a portion of its length with a recess, the lower portion of the recess being formed to receive a drill, a yieldablc block mounted in the lower portion of the 1| Tess, means fitting in said recess to engage the drill, and means to lock the parts in applied position, said latter means operating to compress, the block. Y

3. A drill chuck having a drill receiving opening, a compressible block fixed in the opening to support the drill' shank, and

means for com ressing said block in the securing of the s ank in place.

4. A drill chuck formed with a drill receiving opening, and a block of rubber extending longitudinally of the opening to underlie the drill shank.

5. A drill chuck comprising a body formed for a portion of its length with a recess, the forward port-ion of the recess being of less width than the rear portion thereof, the lower'portion of the ret-c` being formed to receive a drill, a yieldable block mounted in the lower portion of the ref-ess, a clamping section formed to fit in the recess and engage the drill, said section snugly fitting both the reduced and enlarged portions of the recess,

and a locking sleeve slidably engaging the body and overlying the clamping section.

In testimony whereof, I affix my signature in presence of two witnesses.

PETER LONERGAN. Witnesses:

THEOPHILE BERzoR-sKEY,

RUSSELL FULLER. 

